[PATCH] D48690: lld-link: align sections to 16 bytes if referenced from the gfids table

[Bob Haarman via Phabricator via llvm-commits]

inglorion created this revision.
inglorion added reviewers: ruiu, hans, thakis, zturner.

Control flow guard works best when targets it checks are 16-byte aligned.
Microsoft's link.exe helps ensure this by aligning code from sections
that are referenced from the gfids table to 16 bytes when linking with
-guard:cf, even if the original section specifies a smaller alignment.
This change implements that behavior in lld-link.

Fixes PR857012.


https://reviews.llvm.org/D48690

Files:
  lld/COFF/Writer.cpp
  lld/test/COFF/Inputs/guardcf-align-foobar.yaml
  lld/test/COFF/guardcf-align.s

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